Structural changes in aqueous solutions of poly(acrylic acid) and poly(methacrylic acid) in the crossover region

被引：0
|
作者：
Filyakin, AM [1 ]
Litmanovich, EA [1 ]
Petrov, OB [1 ]
Kasaikin, VA [1 ]
机构：
[1] Moscow MV Lomonosov State Univ, Fac Chem, Moscow 119992, Russia
来源：
POLYMER SCIENCE SERIES A | 2003年 / 45卷 / 09期
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D O I：
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中图分类号：
O63 [高分子化学（高聚物）];
学科分类号：
070305 ; 080501 ; 081704 ;
摘要：
Aqueous-saline solutions of poly(acrylic acid) (M-w = 1.4 x 10(5)) and poly(methacrylic acid) (M-w = 3.1 x 10(5)) were studied by phonon correlation spectroscopy and viscometry over a wide concentration range at their own pH values (similar to2-3). As was found, a transition from dilute to semidilute solutions (crossover) is accompanied by the formation of the network of entanglements between macromolecules. In solutions of poly(methacrylic acid), the transition to the region of semidilute solutions is preceded by the formation of stable clusters of macromolecules which is not observed in poly(acrylic acid) solutions.
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页码：893 / 898
页数：6
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